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Giovanni Francesco Sagredo

 

 
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Giovanni Francesco Sagredo
 
 
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Giovanni Francesco Sagredo (1571 – 1620) was a Venetian
Venetian

*Venetian people, an ethnic group in Italy*Venetian language, a language spoken in Veneto, Friuli-Venezia Giulia, Istria and Brazil*Historical inhabitants of the Republic of Venice...
 mathematician
Mathematician

A mathematician is a person whose primary area of study and/or research is the field of mathematics....
 and close friend of Galileo, who wrote: Many years ago I was often to be found in the marvelous city of Venice, in discussions with Signore Giovanni Francesco Sagredo, a man of noble extraction and trenchant wit. He added a scale to Galileo's thermoscope to enable the quantitative measurement of temperature
Temperature

In physics, temperature is a physical property of a Physical system that underlies the common notions of hot and cold; something that feels hotter generally has the greater temperature....
, and produced more convenient portable thermometer
Thermometer

The thermometer is a device that measures temperature or temperature gradient using a variety of different principles; it comes from the Greek language roots thermo, heat, and meter, to measure....
s.






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Giovanni Francesco Sagredo (1571 – 1620) was a Venetian
Venetian

*Venetian people, an ethnic group in Italy*Venetian language, a language spoken in Veneto, Friuli-Venezia Giulia, Istria and Brazil*Historical inhabitants of the Republic of Venice...
 mathematician
Mathematician

A mathematician is a person whose primary area of study and/or research is the field of mathematics....
 and close friend of Galileo, who wrote: Many years ago I was often to be found in the marvelous city of Venice, in discussions with Signore Giovanni Francesco Sagredo, a man of noble extraction and trenchant wit. He added a scale to Galileo's thermoscope to enable the quantitative measurement of temperature
Temperature

In physics, temperature is a physical property of a Physical system that underlies the common notions of hot and cold; something that feels hotter generally has the greater temperature....
, and produced more convenient portable thermometer
Thermometer

The thermometer is a device that measures temperature or temperature gradient using a variety of different principles; it comes from the Greek language roots thermo, heat, and meter, to measure....
s. Sagredo also discussed with Galileo the possibility of a telescope using a mirror.. Galileo honoured him after his death by making him one of the characters in Dialogue Concerning the Two Chief World Systems
Dialogue Concerning the Two Chief World Systems

The Dialogue Concerning the Two Chief World Systems was a 1632 book by Galileo Galilei, comparing the Nicolaus Copernicus system with the traditional Ptolemy system....
 discussing the Copernican
Nicolaus Copernicus

Nicolaus Copernicus was the first astronomer to formulate a scientifically-based heliocentrism cosmology that displaced the Earth from the center of the universe....
 and the Ptolemaic
Ptolemy

Claudius Ptolemaeus , known in English as Ptolemy , was a Roman Greek mathematics, Greek astronomy, geographer and astrologer. He lived in History of Roman Egypt, and was probably born there in a town in the Thebaid called Ptolemais Hermiou; he died in Alexandria around 168 AD....
 theories of astronomy.